/*
 * Copyright (c) 2001, University of Washington, Department of
 * Computer Science and Engineering.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither name of the University of Washington, Department of
 * Computer Science and Engineering nor the names of its contributors
 * may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package one.net.http;

import java.util.Date;
import java.util.TimeZone;
import java.util.Locale;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

/**
 * Utility class to format dates.
 *
 * @author  Daniel Cheah
 * @version $Revision: 1.2 $
 */
public final class DateFormatter {
  /** RFC 822 / 1123 format. */
  private static final String FORM_OUT = "EEE, dd MMM yyyy HH:mm:ss 'GMT'";

  /** The time zone object for GMT. */
  private static final TimeZone gmt = TimeZone.getTimeZone("GMT");

  /** Date formatter for RFC 822 / 1123 (in GMT). */
  private static final DateFormat formOut = new SimpleDateFormat(FORM_OUT, Locale.US);

  /**
   * Format data as string in the proper format.
   *
   * @param date Date to format
   * @return Formatted date as a string.
   */
  public static final String format(Date date) {
    return formOut.format(date);
  }
}
